Lay Lin Owyong, MD
Hematology & Oncology Physician · Stockton, CA
Lay Lin Owyong, MD is a hematology & oncology physician with a practice address in Stockton, California, and NPI 1871667477, issued on Nov 17, 2006. Check the license (California A54077, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Lay Lin Owyong
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- A54077 CA
Self-reported in NPPES; status is on the state search - Practice location
- 7373 West LN, Stockton, CA 95210
- Phone
- (209) 476-2000
- Enumerated
- Nov 17, 2006
- Record last updated
- Dec 13, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00A540770 CA
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →
Also registered at 7373 West LN
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Erica Aguiar, DPTPhysical Therapist1649785825
- Rosario Aguirre, RDRegistered Dietitian1023172988
Verify Lay Lin Owyong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A54077Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
1% more Medicare Part D claims than the average hematology & oncology physician in 2024
882 Medicare Part D claims for 254 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 127 claims were for opioids.
Most prescribed
- Anastrozole168 claims
- Ondansetron Hcl93 claims
- Hydrocodone-Acetaminophen66 claims
- Gabapentin38 claims
- Letrozole36 claims
- Tamoxifen Citrate30 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Lay Lin Owyong among 1,583 hematology & oncology physician records in California
Lay Lin Owyong, MD is one of 1,583 hematology & oncology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 54% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 71% of these records are
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in California
There are 1,583 hematology & oncology physician records in California.
All 1,583 in California → Every provider in Stockton → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Abbas Ghadialy, MDStockton, CA 952101114005022
- Chun Ng, M.D.Stockton, CA 952101104057827
- James Shum, MDStockton, CA 952101770661258
- Aye Soe, M.D.Stockton, CA 952101528304375
- Ikechukwu ChidobemStockton, CA 952091790313260
- Ravleen Grewal, MDStockton, CA 952041679078885
- Dheeraj Kodali, M.D.Stockton, CA 952041508179607
- Amandeep Gill, M.DFrench Camp, CA 952311285838359
Common questions
What is Lay Lin Owyong, MD's NPI number?
Lay Lin Owyong, MD's National Provider Identifier (NPI) is 1871667477, issued on Nov 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Lay Lin Owyong, MD located?
The NPPES record lists a practice address at 7373 West LN, Stockton, CA, 95210. Phone: (209) 476-2000. Providers update this record themselves, so call before visiting.
How can I verify Lay Lin Owyong, MD's license?
NPPES lists California license number A54077, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Lay Lin Owyong, MD prescribe under Medicare Part D?
In 2024, Lay Lin Owyong, MD had 882 Medicare Part D claims for 254 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.